/* =============================================================================
   Gang Sheet Builder — design tokens & base
   ============================================================================= */
:root {
  --gang-primary: #2563eb;
  --gang-success: #16a34a;
  --gang-danger: #dc2626;
  --gang-warning: #f59e0b;
  --gang-nest: #ea580c;
  --gang-dark: #1e293b;
  --gang-sidebar-bg: #f8fafc;
  --gang-border: #e2e8f0;
  --gang-text: #1e293b;
  --gang-text-muted: #64748b;
  --gang-toolbar: #334155;
  --gang-toolbar-input: #475569;
  --gang-radius: 8px;
  --gang-radius-sm: 4px;
  --gang-font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.dtf-transfer-body {
  margin: 0;
  font-family: var(--gang-font);
  color: var(--gang-text);
  background: var(--gang-sidebar-bg);
  overflow: hidden;
  height: 100vh;
}

.visually-hidden,
.dtf__visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* =============================================================================
   Layout — app header + workspace (rail | left | main | right)
   ============================================================================= */
.dtf {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100%;
  overflow: hidden;
}

.dtf__workspace {
  display: flex;
  flex-direction: row;
  flex: 1;
  min-height: 0;
  min-width: 0;
  overflow: hidden;
}

.dtf__sidebar {
  width: 300px;
  flex-shrink: 0;
  background: var(--gang-sidebar-bg);
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
  border-right: 1px solid var(--gang-border);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.dtf__sidebar--left .dtf__left-scroll {
  flex: 1;
  min-height: 0;
}

.dtf__sidebar--right {
  width: 300px;
  border-right: none;
  border-left: 1px solid var(--gang-border);
  display: flex;
  flex-direction: column;
}

.dtf__app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-shrink: 0;
  min-height: 56px;
  padding: 8px 16px;
  background: #0f172a;
  color: #f8fafc;
  border-bottom: 1px solid #1e293b;
}

.dtf__app-header-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.dtf__app-logo {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--gang-primary), #7c3aed);
  flex-shrink: 0;
}

.dtf__app-title {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #f8fafc;
}

.dtf__app-tagline {
  margin: 2px 0 0;
  font-size: 11px;
  color: #94a3b8;
}

.dtf__app-header-center {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex: 1;
}

.dtf__app-header-end {
  flex-shrink: 0;
}

.dtf__header-qty {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #e2e8f0;
  font-size: 13px;
}

.dtf__header-qty-label {
  white-space: nowrap;
}

.dtf__input--header {
  width: 56px;
  padding: 6px 8px;
  background: #1e293b;
  border-color: #334155;
  color: #f8fafc;
}

.dtf__btn--header {
  padding: 8px 14px;
  font-size: 13px;
}

.dtf__btn--close {
  background: transparent;
  color: #fca5a5;
  border: 1px solid #7f1d1d;
  border-radius: var(--gang-radius-sm);
  padding: 8px 14px;
  font-size: 13px;
  cursor: pointer;
}

.dtf__btn--close:hover {
  background: #7f1d1d;
  color: #fff;
}

.dtf__nav-rail {
  width: 52px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 12px 0;
  background: #e2e8f0;
  border-right: 1px solid var(--gang-border);
}

.dtf__nav-item {
  width: 40px;
  height: 40px;
  border: none;
  border-radius: var(--gang-radius-sm);
  background: transparent;
  color: var(--gang-text-muted);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: background 0.15s ease, color 0.15s ease;
}

.dtf__nav-item:hover {
  background: #cbd5e1;
  color: var(--gang-text);
}

.dtf__nav-item--active,
.dtf__nav-item--active:hover {
  background: var(--gang-primary);
  color: #fff;
}

.dtf__nav-item--link {
  font-size: 20px;
}

.dtf__left-scroll {
  display: flex;
  flex-direction: column;
  min-height: 0;
  flex: 1;
  overflow-y: auto;
}

.dtf__left-section {
  padding: 12px 16px;
  border-bottom: 1px solid var(--gang-border);
}

.dtf__left-section--grow {
  flex: 1;
  min-height: 140px;
  display: flex;
  flex-direction: column;
}

.dtf[data-dtf-tab='gallery'] .dtf__left-section[data-dtf-section='upload'] {
  display: none;
}

.dtf[data-dtf-tab='gallery'] .dtf__gallery {
  max-height: min(52vh, 480px);
}

.dtf[data-dtf-tab='settings'] .dtf__left-section[data-dtf-section='upload'],
.dtf[data-dtf-tab='settings'] .dtf__left-section[data-dtf-section='gallery'],
.dtf[data-dtf-tab='settings'] .dtf__left-section[data-dtf-section='props'] {
  display: none;
}

.dtf[data-dtf-tab='uploads'] .dtf__left-section[data-dtf-section='settings'],
.dtf[data-dtf-tab='gallery'] .dtf__left-section[data-dtf-section='settings'] {
  display: none;
}

.dtf__main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  background: var(--gang-dark);
  overflow: hidden;
}

/* =============================================================================
   Left sidebar — sections
   ============================================================================= */
.dtf__header {
  padding: 16px 16px 12px;
  border-bottom: 1px solid var(--gang-border);
}

.dtf__title {
  margin: 0;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--gang-text);
}

.dtf__subtitle {
  margin: 4px 0 0;
  font-size: 11px;
  color: var(--gang-text-muted);
}

.dtf__section {
  padding: 12px 16px;
  border-bottom: 1px solid var(--gang-border);
}

.dtf__section--grow {
  flex: 1;
  min-height: 120px;
  display: flex;
  flex-direction: column;
}

.dtf__section--footer {
  margin-top: auto;
  border-bottom: none;
  padding-bottom: 20px;
}

.dtf__section-title {
  margin: 0 0 8px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gang-text-muted);
}

.dtf__section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.dtf__section-head .dtf__section-title {
  margin: 0;
}

/* Upload zone */
.dtf__upload-zone {
  position: relative;
  border: 2px dashed var(--gang-border);
  border-radius: var(--gang-radius);
  padding: 20px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.dtf__upload-zone:hover,
.dtf__upload-zone:focus-within {
  border-color: var(--gang-primary);
  background: #eff6ff;
}

.dtf__upload-zone--dragover {
  border-color: var(--gang-success);
  background: #f0fdf4;
  transform: scale(1.02);
}

.dtf__upload-input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}

.dtf__upload-icon {
  font-size: 28px;
  display: block;
  margin-bottom: 8px;
}

.dtf__upload-text {
  margin: 0;
  font-size: 13px;
  color: var(--gang-text);
}

.dtf__helper {
  margin: 8px 0 0;
  font-size: 11px;
  color: var(--gang-text);
}

.dtf__helper--muted {
  color: var(--gang-text-muted);
}

/* Gallery */
.dtf__gallery-toggle {
  display: flex;
  gap: 4px;
}

.dtf__icon-btn {
  min-width: 44px;
  min-height: 36px;
  border: 1px solid var(--gang-border);
  border-radius: var(--gang-radius-sm);
  background: #fff;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.dtf__icon-btn:hover {
  border-color: var(--gang-primary);
}

.dtf__icon-btn--active {
  border-color: var(--gang-primary);
  background: #eff6ff;
}

.dtf__gallery {
  display: grid;
  gap: 8px;
  max-height: 200px;
  overflow-y: auto;
  margin-bottom: 10px;
}

.dtf__gallery-actions {
  display: grid;
  gap: 8px;
  margin-top: 6px;
}

.dtf__gallery--grid {
  grid-template-columns: repeat(4, 1fr);
}

.dtf__gallery--list {
  grid-template-columns: 1fr;
}

.dtf__thumb-wrap {
  position: relative;
  width: 60px;
  min-height: 60px;
  height: auto;
}

.dtf__gallery--list .dtf__thumb-wrap {
  width: 100%;
  height: auto;
  min-height: 48px;
  padding-bottom: 26px;
}

.dtf__gallery-meta {
  display: block;
  margin-top: 4px;
  font-size: 11px;
  color: var(--gang-text-muted);
  line-height: 1.3;
}

.dtf__thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--gang-radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.dtf__thumb--selected {
  border-color: var(--gang-primary);
  box-shadow: 0 0 0 2px var(--gang-primary);
}

.dtf__thumb-remove {
  position: absolute;
  top: 2px;
  right: 2px;
  width: 18px;
  height: 18px;
  border: none;
  border-radius: 50%;
  background: var(--gang-danger);
  color: #fff;
  font-size: 12px;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.2s ease, transform 0.15s ease;
}

.dtf__thumb-wrap:hover .dtf__thumb-remove {
  opacity: 1;
}

.dtf__thumb-remove:active {
  transform: scale(0.95);
}

.dtf__empty {
  grid-column: 1 / -1;
  margin: 0;
  padding: 12px;
  font-size: 12px;
  color: var(--gang-text-muted);
  text-align: center;
}

/* Fields */
.dtf__field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 10px;
}

.dtf__label {
  font-size: 11px;
  font-weight: 600;
  color: var(--gang-text-muted);
}

.dtf__input {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--gang-border);
  border-radius: var(--gang-radius-sm);
  font-size: 14px;
  box-sizing: border-box;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.dtf__input:focus {
  outline: none;
  border-color: var(--gang-primary);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

.dtf__input--sm {
  max-width: 120px;
}

.dtf__props-placeholder {
  margin: 0;
  font-size: 12px;
  color: var(--gang-text-muted);
}

.dtf__props-form[hidden] {
  display: none !important;
}

.dtf__props-row {
  margin-bottom: 8px;
}

.dtf__btn--link {
  background: none;
  border: none;
  color: var(--gang-primary);
  cursor: pointer;
  padding: 4px 0;
  margin-bottom: 8px;
}

/* Buttons */
.dtf__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 14px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: background 0.2s ease, color 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
}

.dtf__btn:active {
  transform: scale(0.98);
}

.dtf__btn--full {
  width: 100%;
  margin-bottom: 8px;
}

.dtf__btn--sm {
  min-height: 36px;
  padding: 6px 10px;
  font-size: 12px;
}

.dtf__btn--lg {
  min-height: 48px;
  font-size: 16px;
  font-weight: 600;
}

.dtf__btn--primary {
  background: var(--gang-primary);
  color: #fff;
}

.dtf__btn--primary:hover {
  filter: brightness(1.08);
}

.dtf__btn--success {
  background: var(--gang-success);
  color: #fff;
}

.dtf__btn--success:hover {
  filter: brightness(1.05);
}

.dtf__btn--outline {
  background: #fff;
  border: 1px solid var(--gang-border);
  color: var(--gang-text);
}

.dtf__btn--outline:hover {
  border-color: var(--gang-primary);
  color: var(--gang-primary);
}

.dtf__btn--secondary {
  background: #e2e8f0;
  color: var(--gang-text);
}

.dtf__btn--ghost {
  background: #f1f5f9;
  border: 1px solid var(--gang-border);
  justify-content: flex-start;
}

.dtf__btn--ghost:hover {
  border-color: var(--gang-primary);
}

.dtf__btn--dark {
  background: var(--gang-dark);
  color: #fff;
}

.dtf__btn--dark:hover {
  background: #0f172a;
}

.dtf__btn--danger-outline {
  background: #fff;
  border: 1px solid var(--gang-danger);
  color: var(--gang-danger);
}

.dtf__btn--danger-outline:hover {
  background: #fef2f2;
}

.dtf__btn--icon {
  min-width: 44px;
  padding: 0;
}

.dtf__btn--pulse:hover {
  animation: gang-pulse 1.2s ease-in-out infinite;
}

@keyframes gang-pulse {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(22, 163, 74, 0.4);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(22, 163, 74, 0);
  }
}

.dtf__btn-icon {
  font-weight: 700;
  font-family: Georgia, serif;
}

.dtf__badge {
  display: inline-block;
  margin-left: 6px;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  background: var(--gang-primary);
  color: #fff;
}

.dtf__badge--muted {
  background: #94a3b8;
}

.dtf__inline-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.dtf__icon-row {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.dtf__preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0;
}

.dtf__sheet-list {
  max-height: 160px;
  overflow-y: auto;
}

.dtf__sheet-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  margin-bottom: 8px;
  background: #fff;
  border: 1px solid var(--gang-border);
  border-radius: var(--gang-radius);
  cursor: pointer;
  transition: border-color 0.2s ease;
}

.dtf__sheet-item:hover {
  border-color: var(--gang-primary);
}

.dtf__sheet-item-thumb {
  width: 36px;
  height: 36px;
  object-fit: cover;
  border-radius: var(--gang-radius-sm);
}

/* =============================================================================
   Center — toolbar & canvas
   ============================================================================= */
.dtf__toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  min-height: 48px;
  padding: 0 12px;
  background: var(--gang-toolbar);
  flex-shrink: 0;
}

.dtf__toolbar--canvas {
  gap: 10px;
  border-bottom: 1px solid #1e293b;
}

.dtf__toolbar-group {
  display: flex;
  align-items: center;
  gap: 4px;
}

.dtf__toolbar-divider {
  width: 1px;
  height: 28px;
  background: #475569;
  flex-shrink: 0;
}

.dtf__toolbar-spacer {
  flex: 1;
  min-width: 8px;
}

.dtf__toolbar-margin {
  gap: 8px;
}

.dtf__range--inline {
  width: 72px;
  margin: 0;
}

.dtf__btn--tool {
  min-width: 36px;
  min-height: 36px;
  padding: 0 8px;
  border-radius: var(--gang-radius-sm);
  border: 1px solid #475569;
  background: #475569;
  color: #f1f5f9;
  font-size: 16px;
  cursor: pointer;
}

.dtf__btn--tool:hover {
  background: #64748b;
}

.dtf__btn--tool-active {
  background: var(--gang-primary);
  border-color: var(--gang-primary);
}

.dtf__btn--nest {
  background: var(--gang-nest);
  border: none;
  color: #fff;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--gang-radius-sm);
  cursor: pointer;
  font-size: 13px;
}

.dtf__btn--nest:hover {
  filter: brightness(1.08);
}

.dtf__toolbar--secondary {
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 8px;
  min-height: 44px;
  padding-top: 6px;
  padding-bottom: 6px;
  border-bottom: 1px solid #1e293b;
}

.dtf__toolbar-sublabel {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #94a3b8;
  margin-right: 2px;
}

.dtf__toolbar-nowrap {
  white-space: nowrap;
  color: #e2e8f0;
  font-size: 12px;
}

.dtf__toolbar-nowrap input {
  margin-right: 6px;
}

.dtf__btn--ico {
  min-width: 34px;
  min-height: 34px;
  padding: 0 6px;
  border-radius: var(--gang-radius-sm);
  border: 1px solid #475569;
  background: #334155;
  color: #f8fafc;
  font-size: 15px;
  line-height: 1;
  cursor: pointer;
}

.dtf__btn--ico:hover:not(:disabled) {
  background: #475569;
}

.dtf__btn--ico:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.dtf__btn--ico-danger {
  border-color: #991b1b;
  background: #450a0a;
}

.dtf__btn--ico-danger:hover:not(:disabled) {
  background: #7f1d1d;
}

.dtf__btn--ico-ok {
  border-color: #166534;
  background: #052e16;
}

.dtf__btn--ico-ok:hover:not(:disabled) {
  background: #166534;
}

.dtf__btn--sm {
  font-size: 12px;
  padding: 6px 10px;
}

.dtf__object-hud {
  position: absolute;
  top: 32px;
  right: 12px;
  z-index: 4;
  min-width: 200px;
  max-width: min(280px, 42vw);
  padding: 10px 12px;
  border-radius: var(--gang-radius);
  background: rgba(15, 23, 42, 0.92);
  color: #f1f5f9;
  font-size: 12px;
  line-height: 1.45;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
  pointer-events: none;
}

.dtf__object-hud-title {
  font-weight: 700;
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #94a3b8;
  margin-bottom: 6px;
}

.dtf__object-hud-dpi {
  margin-top: 6px;
  font-weight: 600;
  color: #86efac;
}

.dtf__object-hud-dpi--warn {
  color: #fcd34d;
}

.dtf__object-hud-dpi--bad {
  color: #fca5a5;
}

.dtf__crop-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

@media (max-width: 520px) {
  .dtf__crop-grid {
    grid-template-columns: 1fr;
  }
}

.dtf__toolbar-label {
  display: flex;
  align-items: center;
}

.dtf__select {
  background: var(--gang-toolbar-input);
  color: #fff;
  border: none;
  border-radius: var(--gang-radius-sm);
  padding: 8px 12px;
  font-size: 14px;
  cursor: pointer;
}

.dtf__toolbar-inline {
  display: flex;
  align-items: center;
  gap: 6px;
  color: #e2e8f0;
  font-size: 13px;
}

.dtf__custom-size-inline {
  display: flex;
  gap: 12px;
  align-items: center;
}

.dtf__custom-size-inline[hidden] {
  display: none !important;
}

.dtf__canvas-wrap {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.dtf__canvas-footer {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  padding: 8px 12px;
  background: #0f172a;
  border-top: 1px solid #1e293b;
}

.dtf__zoom-pct {
  min-width: 52px;
  text-align: center;
  font-size: 12px;
  font-weight: 600;
  color: #94a3b8;
}

.dtf__canvas-footer-spacer {
  flex: 1;
}

.dtf__btn--icon-sm {
  min-width: 32px;
  min-height: 32px;
  font-size: 14px;
}

.dtf__section--card {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.dtf__section-title--card {
  margin-bottom: 10px;
}

.dtf__sheet-card {
  padding: 14px;
  border-radius: var(--gang-radius);
  border: 1px solid var(--gang-border);
  background: #fff;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.06);
}

.dtf__sheet-card-name {
  font-weight: 700;
  font-size: 15px;
  color: var(--gang-text);
  margin-bottom: 4px;
}

.dtf__sheet-card-size {
  font-size: 12px;
  color: var(--gang-text-muted);
  margin-bottom: 8px;
}

.dtf__sheet-card-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--gang-primary);
  margin-bottom: 10px;
}

.dtf__field--compact {
  margin-bottom: 8px;
}

.dtf__sheet-card-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 4px;
}

.dtf__btn--sm-mt {
  margin-top: 10px;
}

.dtf__canvas-stage {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 24px 28px 48px 28px;
  background-color: #64748b;
  background-image:
    linear-gradient(45deg, #94a3b8 25%, transparent 25%),
    linear-gradient(-45deg, #94a3b8 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #94a3b8 75%),
    linear-gradient(-45deg, transparent 75%, #94a3b8 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}

.dtf__canvas-pan {
  position: relative;
  z-index: 1;
  transition: transform 0.05s ease-out;
}

.dtf__ruler {
  position: absolute;
  background: var(--gang-toolbar-input);
  color: #94a3b8;
  font-size: 9px;
  z-index: 2;
  user-select: none;
}

.dtf__ruler--h {
  top: 8px;
  left: 36px;
  right: 16px;
  height: 20px;
  display: flex;
  align-items: flex-end;
}

.dtf__ruler--v {
  top: 28px;
  left: 8px;
  bottom: 40px;
  width: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: flex-end;
}

.dtf__ruler-tick {
  flex: 1;
  text-align: center;
  border-left: 1px solid #64748b;
}

.dtf__ruler-tick--major {
  border-left-color: #cbd5e1;
  font-weight: 600;
  color: #cbd5e1;
}

.dtf__canvas-shell {
  position: relative;
  background: #fff;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
  border-radius: var(--gang-radius-sm);
  transition: transform 0.2s ease;
  z-index: 1;
}

.dtf__overlays {
  position: absolute;
  bottom: 12px;
  left: 36px;
  margin: 0;
  padding: 10px 12px;
  border: none;
  border-radius: var(--gang-radius);
  background: rgba(15, 23, 42, 0.85);
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 3;
}

.dtf__check {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #f1f5f9;
  font-size: 12px;
  cursor: pointer;
  user-select: none;
}

.dtf__check input {
  appearance: none;
  width: 18px;
  height: 18px;
  border: 2px solid #94a3b8;
  border-radius: 3px;
  cursor: pointer;
  flex-shrink: 0;
  position: relative;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.dtf__check input:checked {
  background: var(--gang-primary);
  border-color: var(--gang-primary);
}

.dtf__check input:checked::after {
  content: '';
  position: absolute;
  left: 4px;
  top: 1px;
  width: 4px;
  height: 8px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.dtf__legend {
  position: absolute;
  bottom: 12px;
  right: 12px;
  padding: 12px;
  border-radius: var(--gang-radius);
  background: rgba(0, 0, 0, 0.8);
  color: #fff;
  font-size: 12px;
  max-width: 260px;
  z-index: 3;
}

.dtf__legend[hidden] {
  display: none !important;
}

.dtf__legend-title {
  margin: 0 0 8px;
  font-weight: 600;
}

.dtf__legend-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.dtf__legend-list li {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 4px 0;
}

.dtf__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.dtf__dot--optimal {
  background: #16a34a;
}
.dtf__dot--good {
  background: #f59e0b;
}
.dtf__dot--bad {
  background: #dc2626;
}
.dtf__dot--terrible {
  background: #991b1b;
}
.dtf__dot--min {
  background: #64748b;
}
.dtf__dot--overlap {
  background: #3b82f6;
}

.dtf__range {
  width: 100%;
  margin-top: 4px;
  accent-color: var(--gang-primary);
}

/* =============================================================================
   Modals
   ============================================================================= */
.dtf-modal[hidden] {
  display: none !important;
}

.dtf-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.dtf-modal__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  animation: gang-fade-in 0.2s ease;
}

.dtf-modal__box {
  position: relative;
  width: 100%;
  max-width: 600px;
  max-height: 80vh;
  overflow-y: auto;
  padding: 24px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
  animation: gang-slide-up 0.3s ease;
}

@keyframes gang-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes gang-slide-up {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.dtf-modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.dtf-modal__title {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
}

.dtf-modal__close {
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  background: transparent;
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  color: var(--gang-text-muted);
}

.dtf-modal__close:hover {
  background: #f1f5f9;
}

.dtf-modal__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.dtf-modal__card {
  border: 1px solid var(--gang-border);
  border-radius: var(--gang-radius);
  padding: 8px;
  cursor: pointer;
  position: relative;
  transition: border-color 0.2s ease;
}

.dtf-modal__card:hover {
  border-color: var(--gang-primary);
}

.dtf-modal__card-del {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 22px;
  height: 22px;
  border: none;
  border-radius: 50%;
  background: var(--gang-danger);
  color: #fff;
  cursor: pointer;
  font-size: 14px;
}

.dtf-modal__pager {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
}

.dtf-modal__footer {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 20px;
}

/* =============================================================================
   Toasts
   ============================================================================= */
.dtf-toast-container {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.dtf-toast {
  pointer-events: auto;
  min-width: 280px;
  max-width: 360px;
  padding: 12px 16px;
  border-radius: var(--gang-radius);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  animation: gang-toast-in 0.3s ease;
  position: relative;
  overflow: hidden;
}

@keyframes gang-toast-in {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.dtf-toast--success {
  background: #f0fdf4;
  border-left: 4px solid var(--gang-success);
  color: #166534;
}

.dtf-toast--error {
  background: #fef2f2;
  border-left: 4px solid var(--gang-danger);
  color: #991b1b;
}

.dtf-toast--warning {
  background: #fffbeb;
  border-left: 4px solid var(--gang-warning);
  color: #92400e;
}

.dtf-toast--info {
  background: #eff6ff;
  border-left: 4px solid var(--gang-primary);
  color: #1e40af;
}

.dtf-toast__bar {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  background: currentColor;
  opacity: 0.35;
  animation: gang-toast-progress linear forwards;
}

@keyframes gang-toast-progress {
  from {
    width: 100%;
  }
  to {
    width: 0%;
  }
}

/* =============================================================================
   Scrollbars
   ============================================================================= */
.dtf__sidebar::-webkit-scrollbar,
.dtf__gallery::-webkit-scrollbar,
.dtf__sheet-list::-webkit-scrollbar,
.dtf-modal__box::-webkit-scrollbar {
  width: 6px;
}

.dtf__sidebar::-webkit-scrollbar-track,
.dtf__gallery::-webkit-scrollbar-track {
  background: transparent;
}

.dtf__sidebar::-webkit-scrollbar-thumb,
.dtf__gallery::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 3px;
}

.dtf__sidebar::-webkit-scrollbar-thumb:hover,
.dtf__gallery::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

/* =============================================================================
   Responsive
   ============================================================================= */
@media (max-width: 1024px) {
  .dtf__sidebar--right {
    position: fixed;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 900;
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.15);
    transform: translateX(100%);
  }

  .dtf__sidebar--right.is-open {
    transform: translateX(0);
  }
}

@media (max-width: 768px) {
  .dtf__workspace {
    flex-direction: column;
  }

  .dtf__nav-rail {
    flex-direction: row;
    width: 100%;
    height: auto;
    padding: 8px;
    justify-content: center;
    border-right: none;
    border-bottom: 1px solid var(--gang-border);
  }

  .dtf__sidebar {
    width: 100%;
    max-height: 40vh;
    border-right: none;
    border-bottom: 1px solid var(--gang-border);
  }

  .dtf__sidebar--right {
    width: 100%;
    max-height: 35vh;
    transform: none;
    position: relative;
  }
}

/* Loading skeleton */
@keyframes gang-spin {
  to {
    transform: rotate(360deg);
  }
}

.dtf__spinner {
  width: 24px;
  height: 24px;
  border: 3px solid #e2e8f0;
  border-top-color: var(--gang-primary);
  border-radius: 50%;
  animation: gang-spin 0.7s linear infinite;
}